#程序的流程控制

#顺序结构
# #选择结构
# n=eval(input('请输入:'))
# if n:
#     print('true')
# elif n==0:
#     print('0')
# else:
#     print('false')
# #(条件表达式)
# result='true' if n else 'false'
# print(result)
# #模式匹配
# n=eval(input('请输入:'))
# match n:
#     case 1:
#         print('1')
#     case 2:
#         print('2')
#     case 3:
#         print('3')

#循环结构
# #for
# s='nihao'
# for i in s:
#     print(i,end=' ')
# print('\n')
# for i in range(10):
#     print(i,end=' ')
# #while
# n=10
# while n > 0:
#     print(n,end=' ')
#     n-=1
#练习题
# #1
# n=5
# while n>0:
#     print(n*'*',end='\n')
#     n-=1
#2
n=5
m=4
while n>0:
    while m>=0:
        print(' ')